简单按钮点击事件：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div >
输入框的绑定简单实现
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="../build/react.js"></script>
<script src="../build/react-dom.js"></script>
<script src="../build/browser.min.js"></script>
</head>
<body>
<div >